Polymerization of butadiene hydrocarbons



. Patented Jen. :1931' polymerization of'whioh will "and emulsifying agent v UNITED srnrns, PATENT. --0.FFIC,.E

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The present invention relates to an impmvement in the polymerization of buts diene hydrocarbons in emulsion with water Several methods areknown to fillymerize butadiene hydrocarbons, auch as (1.3), iso rene 2.&,- dimethylbutad1ene- (1.8), and the ike, 1n emulsions-that means by emulsifying the hydrocarbon with suitable emulsi 'ng agents, such as ueous aolu-l tions 0 soaps, salts ofbile acids; salts of alkylated naphthalene sulfonic acids and on like, and causing polymerization to take place by shaking or stirring these emulsions,

if desired WllllB gently heatin These methods as they have been han ed u to date have the disadvantage thnt it i rather diflicult to get emulsions'gii ingnear quantitative yie ds of polymerization p unto.

Now we have found that this iisedvanta 0 can easily be overcome by su ecting e emulsions. before the olymerization to a homo nizi process, or instance by forcing e em 'ons throw-small apertures according to usual meth By this homoenizing rooess moot finely unicam in stable emulsions are e, rim-much quicker nndI-in a far better yield than that of the corresponding not homogenized emulsions.

The following examples illustrate our illvention without limiting'it thereto, the parts being by weight Example I.- parts of isoprene are emulsified in 1'00 parts of an aqueous solution of sodium oleato of 10% strength while shaktadien'e-.

caustic was 1,. are emulsified in tum vessel by shaking. The unstable, not uniform emulsion thus obtainable iathenhomo 'niuedinaho '1' aeeordin to D. P. mm W; er Nash in-Lubec k sided in a closed vessel while shaking and gently heating. Thu-emulsion is homogen wed in a homo r' and polymerization is caused b heating the homogenized emulsion to for about 8 do 8.. From the latex like cream thus obtain the benzene is re-\ moved liter ation by distillation or extraction. The yield of olymeriflite is considerably higher than t at obtainable from the same hut'not homogenized emulsion.

- Ecample IPA mixture of 50 parts ofbutndime-(1.8) ind parts of 2.8-dimethylbumay be produced'for inum steer-ate of 6%atrength are emultubule-(1.8) are emulsified in 150 parts of i an aqueous solution of sodium olente of 10% strength and 4 parts of 1/1 n. caustic soda lye accordin to Example 2, homogenized and lymenzed. A rubber like lymerizate is thus obtained in a quantitative yield.

We claim .7 '1. In the process of ploymerizing a butadiene hydrocarbon in emulsion with water and an emulsifying agent, the step which comprises homogenizing the emulsion before polymerizing.

2. In the process of polymerizing a compound of the group consisting of butndicne- 1.3), isoprene and 2.3-dimethylbutediene- 1.3), in emulsion with water and an emulsiying agent the step which comprises homogenizing the emulsion before polymerizing.

3. In the process of polymerizin a butadiene hydrocarbon in emulsionwit water and an emulsi agent, the step which comprises homogenizing the emulsion before polymerizing by forcing it through small apertures.

4. In the process of polymerizing a compound of the group consisting of butudieno- (1.3), isoprene and 2.3-dimethylbutadiene- 5 (1.3) in emulsion with water and an emulsifying agent the step which comprises homogonizing the emulsion before polymerizing by forcmg it through small apertures.

In testlmony whereof we have hereto set our hands.

HANS 'LECHER. [L. 5.] ALBERT KOCH. [1. 5.]

polymerizing by forcing it through small apertures.

4. In the process of polymerizing a compound of the group consisting of butndiene- 1.3), isoprone and 2.3-dimethylbutadiene- 1.3) in emulsion with water and an emulsithe emulsion before polymerizing In testimony whereof we have hereto set HANS "LECHER. L. s.] ALBERT KOCH. EL. 8.]

our hands.

DIS LAIMER 1,789,873.Hana Lecher, Leverkusen, end Albert Koch, Cologne-Deutz Germany. fggilrumgrul'rron 0E1 Bggmmn; YnnofARBoNs. Patent dated January 20 15c auner e une 2 1934 th Akmwueaschafi y e assignee, G. Farbemndusme Therefore enters this disclaimer to certain of th 1 Patent, Ila-magi, claims 1 and 2. e c ms of the above ldentlfied [Oflicwl zette July 24, 1934.] r

DISCLAIMER 1,789,873.-Hane Lecher, Leverkusen, and Albert Koch, Cologne-Deutz, Germany.

OLYMERIZATION 0F BUTADIENE HYDROCARBONS. Patent, dated January 20,

1931. Disclaimer filed June 22, 1934, by the assignee, I. G. Farbenindqwtrie Akt'iengesellschaft.

Therefore, entqrs this disclaimer to certain of the claims of the above identified patent, namel claims 1 and 2.

[Oficial eette July 24, 1.934.] 

